A dual-energy medical instrument for measurement of x-ray source voltage and dose rate

V. D. Ryzhikov; S. V. Naydenov; V. G. Volkov; O. D. Opolonin; S. Makhota; T. Pochet; C. F. Smith

doi:10.1117/12.2214221

25 March 2016 A dual-energy medical instrument for measurement of x-ray source voltage and dose rate

V. D. Ryzhikov, S. V. Naydenov, V. G. Volkov, O. D. Opolonin, S. Makhota, T. Pochet, C. F. Smith

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 97834X (2016) https://doi.org/10.1117/12.2214221
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

An original dual-energy detector and medical instrument have been developed to measure the output voltages and dose rates of X-ray sources. Theoretical and experimental studies were carried out to characterize the parameters of a new scintillator-photodiode sandwich-detector based on specially-prepared zinc selenide crystals in which the low-energy detector (LED) works both as the detector of the low-energy radiation and as an absorption filter allowing the highenergy fraction of the radiation to pass through to the high-energy detector (HED). The use of the LED as a low-energy filter in combination with a separate HED opens broad possibilities for such sandwich structures. In particular, it becomes possible to analyze and process the sum, difference and ratio of signals coming from these detectors, ensuring a broad (up to 10⁶) measurement range of X-ray intensity from the source and a leveling of the energy dependence. We have chosen an optimum design of the detector and the geometry of the component LED and HED parts that allow energy-dependence leveling to within specified limits. The deviation in energy dependence of the detector does not exceed about 5% in the energy range from 30 to 120 keV. The developed detector and instrument allow contactless measurement of the anode voltage of an X-ray emitter from 40 to 140 kV with an error no greater than 3%. The dose rate measurement range is from 1 to 200 R/min. An original medical instrument has passed clinical testing and was recommended for use in medical institutions for X-ray diagnostics.

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V. D. Ryzhikov, S. V. Naydenov, V. G. Volkov, O. D. Opolonin, S. Makhota, T. Pochet, and C. F. Smith "A dual-energy medical instrument for measurement of x-ray source voltage and dose rate", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97834X (25 March 2016); https://doi.org/10.1117/12.2214221

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KEYWORDS

Sensors

X-rays

Signal detection

Scintillators

Optical filters

Absorption

Crystals

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